Machine for scarfing bars or rods.



R. A. CARTER. MACHINE FOR SCARFING BARS 0R RODS.

APPLICATION FILED AUGAZ} 1914.

Patented July 13, 1915.

2 SHEETSSHEET l.

INVENTOR WITNESSES I I R. A. CARTER.

MACHINE FOR SCARFING BARS'OR RODS.-

APPLICATION mu) AUG.12.1914.

1, 146,6 1 1 Patented July 13, 1915.

2 SHEETS-SHEET 2.

I Wwmwwh rr saans ranr current.

ROBERTA. CARTER, 0F PITTSBURGH, PENNSYLVANIA.

MACHINE FOR SCARFING BARS OR RODS.

Specification of Iietters Patent.

Patented July 13, 1915.

Application filed. August 12, 1914. Serial No. 856,381.

To all whom it may concern: v

Be it known that I, ROBERT A. CARTER, residing at Pittsburgh, in thecounty of Allegheny and State of Pennsylvania, a citizen of the UnitedStates, have invented or discovered certain new and useful Improvementsin Machines for Scarfing Bars or Rods, of which improvements thefollowing is a specification.

The invention described herein relates to certain improvements inmachines for shaping the ends of bars or rods, which are to be united bywelding. It has heretofore been the practice especially in themanufacture of links to impart the desired bevel to the ends to bewelded by a shearing operation, or to hammer out the ends one at a timeto the desired bevel. In the shearing operation, the pressure of theshear blade generally distorts the ends so that they must be broughtback to shape by hammering or other suitable means. i

The invention described herein has for its object the provision of meanswhereby a simultaneous shaping of two surfaces preparatory to weldingcanbe effected, and it is a further object of the invention to provide forthe cuttingof a bar or rod into sections of the desired length, and atthe same operation to bevel and otherwise shape the portions of themetal on both sides of the out.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification,Figure 1 is a top plan view of my improved machine; Fig. 2 is a verticalsection on a plane indicated by the line IIII Fig. 1; Figs. 3 and 4 arevertical sections indicated respectively by the lines IIIIII and IV-IVFig. 2; Fig. 5 is an elevation of the shear blade and the adjacent maledies; Fig. 6 shows the shape imparted to the end of a bar or rod; Fig. 7is a view similar to Fig. 5 but illustrating a modification in the shapeof the male dies, and Fig. 8 shows the shape imparted by the die shownin Fig. 7

In the practice of my invention, the female dies 2, 2 are secured to anabutment 1 formed on or attached to the bed plate 3. As shown in Figs. 2and 3 these dies are grooved, portions a of such grooves being straightand of a diameter approximately equal to that of the rod under operationso as to support the parts of the bar or rod on each side and a shortdistance away from the line out as hereinafter described. When it isdesired to so shape the edges of the scarfed portionsof the ends to bejoined as shown in Fig. 6 as to partially infold or fit around the rodsections in the rear of the scarfed ends, the portions Z) of the groovesin the faces of the dies are flared such flared portions extending tothe line of cut.

The shear blade 4 is secured in the crosshead 5, which may be operatedby any suitable means such for example as the fluid pressure cylinder 6,the cross-head being secured to the piston rod 7 of said cylinder. Themale dies 8, 8 should be so operated as to begin their action on the rodbefore the latter has been entirely severed, and hence it is preferredthat these dies should be secured to the cross-head, one on each side ofthe blade 4-, as shown in Figs. 1, 2 and 4. It will be observed that thedies and blade 4 are so constructed and so at tachednto the cross-head,that the bar orrod will be only partially severed before the dies begintheir shaping operation.

It will observed that the operative faces of the dies are oppositelyinclined and therefore when acting on the bars or rods they will act asa wedge tending to force the metal in opposite directions. If the bar orrod was entirely severed prior to the action of the dies, means wouldnecessarily be em ployed to prevent the movement of the sections awayfrom the dies. As the double scarfing causes a longitudinal flow ofmetal in opposite directions and consequent elongation proportional tosuch flow, it is impracticable to employ fixed stops or others whichwould prevent the flow and consequent elongation.

In the operation of the machine, which is especially adapted to carryout the method described and claimed in an application Serial No.856,382, filed August 12th, 1914:, the bodily longitudinal movement ofthe parts of the bar or rod on opposite sides of the blade is preventedby the unsheared portion of the bar or rod, during the initial shapingaction of the dies. Until the blade has passed entirely through the rodor bar, this connecting web will be eifective, but as this connectingweb will be removed before the scarfing or shaping operation iscompleted, the operative faces of the dies 8, 8 are provided with teethor so roughened, so as to grip the surfaces of the bar or rod sections,and thereby prevent a bodily longitudinal movement of the sectionsduring the final portion of the shaping operation. roughened faces ofthe dies have only a superficial grip on the sections, the flow ofthe'internal metal, or portions not immediately engaged by the dies is notinterfered with.

The feed of. the bar onrod into the machine is regulated. by amovablestop 9, which in. the construction. shown is so pivotallymountedona pin 10,. as to drop when free to move, into the path of movement ofthe bar or rod. In: order that the stop may not interfere with theelongation of the bar-during. the searfing operation, provision shouldbe made. for shifting-it, before thershearing and shaping operationsbegin. This shiftin may be effected. by a finger 11 on the cross-headengaging and lifting the stop as the cross-head moves forward, andpermits thestop to drop to operative position when:

the: cross-head is. moved back.

Vhen fOl'l'lHIl 'l the. scarfs. with curved 11 as c as shown in Fig. 3the inner. ends of the:

male dies 8, 8 are curved inwardly asshown in F 1g. 5, but when making aplainfiat scarf as shown inFig. 8, the dies are straight as.

scarfed and hence the bar or rod should beturned one hundred and eightydegrees, on each forward feed.

As the I claim herein as my invention:

1. In. a machine for scarfing the ends of bars, etc, the combination ofspaced blocks provided with matrices, a reciprocating head, shaping diesand a shear blade secured to saidhead, the blade being arrangedintermediate the dies and in fixed relation thereto.

2. In a machine for scarfing the ends of bars, etc., the combination; ofspaced blocks provided with matrices, a reciprocating head, shaping dieshaving oppositely inclined operative faces, a. shear blade, said diesand blade being secured to the head, the bladebeing intermediate'thedies and in such relation to the-latter that thedies will begin tooperate on the bar on both sides of the line of out prior to thecomplete severance of the-bar by the'blade;

3.v In a machine for scarfing the ends of bars, etc, the combination ofspaced blocks provided with matrices, a reciprocating head, shaping dieshaving V shaped operativefacesand a shear blade carried by said head,and a. movable stop or gage block for limiting the movement of the baror-rod into the machine and adapted to be shifted to inoperativeposition by the head when moving inwardly.

In testimony whereof, I. have hereunto set my hand.

ROBERT A. CARTER. Witnesses G. G. TRILL,.

THOS. B. Jones.

Copies of thispatent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

